Rod-turning machine.



J. R. GAMMEIER.

ROD TURNING MACHINE.

APPLICATION FILED FEB. 8,1918.

Patented Apr. 22, 1919.

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I J. R. GAMMETER.

ROD TURNING MACHINE.

APPHCATION men FEB. a. 1913.

1 3G1 @79 PatentedApr. 22, 1919.

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J. R. GA'MMET'ER. ROD TURNING MACHINE.

APPLICATION FILED FEB. 8. 8918.

1,391,679,, Patented Apr. 22, 1919.

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JOHN R. GAMMETER, 0F AKRON, OHIO, ASSIGNOR TO THE B. F.

GOODRIGH COMPANY, OF

NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ROD-TURNING MACHINE.

Specification of Letters Patent.

Patented Apr. 22, 1919 Application filed February 8. 1918. Serial No. 216,066.

useful Improvements in Rod-Turning 'Ma-- chines, of which the following is a specification. I 1

This invention relates to machines for turning cylindrical rods of hard rubber, metal or other material, of the type employing an automatic mechanism for feeding the rods longitudinally and at the same time rotating them while subjected to the action of the grinding wheel or other stockremoving tool in order that the latter may reduce the rod to the form of a true cylinder of the desired diameter; together, preferably, with an automatic magazine feeder to automatically introduce the rods to the action of said rotating and feeding mechanism, and means to guide them before and after their introduction. My invention includes improvements in feeding chucks of the centrifugal gripping type for machines of this character, and improvements in the side-thrust block or work-rest.

Of the accompanying drawings,

Figure 1 is a front elevation, partly broken away, showing a rod-grinding machine embodying my improvements.

Fig. 2 is an end elevation, partly broken away.

Fig. 3 is a detail end elevation of one of the feeder drives.

Fig. dis a vertical longitudinal section and elevation of oneof the units of the feeder-chuck mechanism.

Fig. 5 is a cross section on the line 55 of Fig. 4.

Fig. 6 is a perspective view of the rod magazine and its positive feeder.

Figs. 7, 8 and 9 are, respectively, a perspective view, a longitudinal section and a detail plan view of the device for opposing the lateral thrust of the grinding wheel against the work.

For storing a quantity of the unground rods and positively introducing them oneby-one to the action of the frictional rodfeeding devices or feeder-chucks, I employ a magazine 10 supported by legs 11 upon a. base-plate 12 which has a tongue-and-groove guiding connection 13 with abedplate 14, the latter being mounted upon a pedestal 15,

r and the base-plate having slots 16 occupied by bolts 17 for the purpose of fixing the magazine at the proper distance from the first unit of the feeder-chuck mechanism. The magazine comprises a sloping chute or platform 18 on which the rods are stored, an oppositely-sloping wall 19, and a guardstrip 19 adjustably mounted on the latter in a position to admit the lowermost rod in the stack. At the bottom of the platform l8runs the upper stretch of an endless chain 20 havinga suitable number of projections 21 thereon for engaging the rear end of the lowermost rod and positively advancing it from the bottom of the stack, said chain being mounted upon sprocket wheels 22, 23,

the latter of which is driven by a belt 24, through a pulley 2 1 and worm gearing 25.

26 is a hollow pedestal or tank having bearings 27 in which is journaled the shaft 28 of a grinding wheel 29, the latter being composed of a suitable abrasive, such as carborundum, and rotated at high speed in the direction of the arrow by a belt and pulley (not shown). 30 is an adjustable dressing tool for truing the edge face of the grinding wheel.

31 is a sliding base carrying the feederchuck devices and mounted on guides 32 on the pedestal 26 for adjusting the radial position of the rod axis with reference to the edge face of the grinding wheel, and 33 is a graduated hand-wheel adjustment for fixing the position of the work accurately in the desired relation to said grinding wheel. 34: is a lateral-'thrust-opposing device hereinafter described.

The rod-rotating and feeding units'are two in number, of similar construction, lo-

cated in casings 35 upon opposite sides of the plane of the grindingwheel, for successively engaging and rotating the rods and progressively feeding them past the wheel. These devices are of the nature of workfeeding friction chucks, and each embodies in its construction two serially-positioned pairs of work-gripping wheels 36, 36, 37 37 occupying planes at right-angles to each other and having grooved peripheries of frictional material such as compressed cloth, paper, vulcanized fiber or the like, the laminations of which are indicated in Fig. 5 These wheels have an orbital movement about the axis of the work and also a rotary movement on their own axes, being secured to shafts 38, 39 mounted in hearings on the extremities of levers 40, ll which are fulcrumed on shafts 42, L3 journaled 1n bearing bosses 44-, 45, formed upon a hollow- 5 shaft 46, the levers and their wheels being thus carried eccentrically or orbitally on said shaft. The other ends of the levers are formed with Weights 146, 47 which tend to rock the levers and press the gripping.

wheels against the work by the act-ion of centrifugal force when-the sha ft 16 1s: r0- tated. Said shaft has "a central aperture 01' bore 147 forthe passage-of the rods, and

side openings 48,: i9 thereto for admitting the'gripping; wheels. The shaft is mounted in anti-friction bearings 50, 51 and provided with a belt pulley 52 for rotating it. a

For positively rotating the several grip- PIIIg'WhGGlS, spur-4 gear-s53, 54: are keyed to the shafts 38, 39 and meshed with mating spu r gears 55, 56- keyed to the fulcrum" shafts -l2-,l3. On the opposite ends :of the latter are secured worm gears 57 58 WlllGh' HlGSll witlrworms 59, 60 formed on shafts 61,62,-

the latter being. mounted parallel to the shaft 46 in anti-friction bearings 63, 64a and carried around orbit-ally by the rotation of said shaft i6. shafts are-secured planetary spur-gear pinions 65, 66 meshingwithcentral spurgears 67, 68 w-lnclrlare seeuredto the housings of 'the ball' bear1ngs-50, 51 and thereby held thenragazine' 10 and the receiving. end of 'fthe hollow shaftati ofthe first feedenchuck unit; in line-with said shaft and witlvthedischarging.point. of the magasaingfor guidmg and 'conductingthe rods from sa1dmag azine nto the hollowshaft, this guide" be ing clamped in a bracket 71 on the sli de 3l. Asimilar gu1de 72 1s=c1ainped1n a bracket- 73 in line with the discharge end of" the hollow shaft i6 in the SGGOIIChfQQdGI ChHOk unit.

- Opposite the working edge' of whee'l 29, at the grinding. position, is a lateralthrust block or work support 73 incorpo rated in the thrust device 34' which is shown in detail in Figs. 7 8 and 9. The face of this block is formed with a half-round groove'fll whose middle portion is parallel with the line ofi feeding'movement and whose ends-slope toward and away from said linehto give the forward end of the rod 5 a proper entrance asit approaches, and reheve the side thrust on its finlshed rear end ust as it leaves the grinding wheel.

Block-:7 3 is mounted on a slide 7 6, which in turn is-guided for transverse movement on the"ma1n crosss11de 31, and ad usted by @n the ends of-the wornrmeans of a screw 7 7 which works in a relatively-stationary nut 78, the screw being suitably shouldered against-itsslide 76- and havinga-handwvheel 79 for turning it to perform the adjustment of block 7 3.

In the operation of the machine, a quantity of unground rods is stacked on the platform orchute 18 of the magazine 10,-and the projections 2 1v onthe chain 20 running along the bottom of said magazine cause the rods to be positively fed one-by-one from the bottom of the stack into the guidehtube 70. The automatic magazine feeder could be dispensed with 4 and the rods introduced by hand to the-h0llow shaft of; the firstSO feeder-chuck unit without departing from my in:vention,-but such method would involve constant attendance at the receivingend, and would be less-convenient and sat isfactory than the one sliown- The chaini advances-the rod 75 i11to the grip of the first pair of groovedfriction wheels ofwthe right-l1and chuck unitUshow-n in. Fig 1, corresponding, to the: pairaof wheels 37 of the left-hand unit illustratediin- Fig.1 4:,vfLIlCi the rod is thereby advanced to the secondpair of'grooved wheelst36, and thence-out through the end shield '69 of the first unit; across-the edge face of theabrasive wheel 29 and into and througlrtheend shield: 69:95 and hollow shaft L6 of the second unit whose gripping wheels engage-the rod and continue-its-feeding movement until the fin-.

- ished rod-is discharged through thetiibtilai'i guide 72, each SUCCGSSlVG IOCl being-pushed 1 out of said guide by'the'rod behinddt. The rotation of the gripping .wh'eels is caused by the orbital movement of the planeta'ry pinions 65,66 about the central fixed gears 67: 68, producing rotatioir of the 'planet gears which is: transmitted through the intermediate' worm andspur gearing itO' the gripping wheels. The centrifugal weights 1 :6, i7 keep the gripping wheels yieldingly pressed against the rod, and the orbital revolution of said wheels turns the rod about itsown axis duringthe long-itudinal feeding movement thereof, so th-atthe stock' is: uniformly; removed during: the transitioflthe rod across the periphery of the abrasive 115 wheel 29, and the rod isthereby ground to a true cylindrical surface of a' dia-meter determined by therad ial distance between the 'rods axis and i said periphery off the grinding wheel; The thrust-block73 keeps the-rod from being'defiectedbyiithe side pressure of the grinding wheel=-against it, andproperly guides said rod in passing from the first chuck unit, across'the open space andintothe-secondunit: The employ- 12 5 ment of the centrifugally weighted levers makes-it possible to dispense with springs for holding the gripping .wheels against thewvork. The provision in each chuckoftwo serially-mounted pairs of gripping wheels in diflerent planes furnishes adequate driving power without heavy pressure and more accurately centralizes the work than in chucks using only a single pair of wheels.

In place of the grinding wheel, any other suitable rod-turning or stock-removing or other tool may be-employed, and various modifications of constructional embodiment may be made without departing from my invention.

I claim:

1. In a rod-turning machine, a hollow rotary shaft, a lever pivoted eccentrically thereon and having a centrifugal Weight at one side of its pivot, a rod-gripping friction wheel journaled on said lever at the other side of its pivot, and means for positively rotating said wheel on its axis.

2. In a rod-turning machine, a chuck comprising two sets of rod-gripping friction wheels serially positioned in fixed angular relation in different planes, means for orbitally revolving them to rotate the rod, and means for positively rotating said wheels to advance the rod axially.

3. In a rod-turning machine, a hollow rotary shaft, two pairs of rod-gripping wheels journaled eccentrically thereon in planes at right angles, and means for positively rotating said wheels on their axes.

4. In a rod-turning machine, a hollow rotary shaft, two pairs of grooved, rod-gripping Wheels eccentrically mounted thereon in planes at right angles, centrifugally-actuated means for projecting said wheels toward the shaft axis, and means for positively rotating said wheels on their axes.

5. In a rod-turning machine, a hollow rotary shaft, a lever eccentrically pivoted thereon and having on opposite sides of its pivot a centrifugal weight and a rod-gripping wheel, a gear carried by the lever 00- axially with said wheel for rotating the latter, an intermeshing gear co-axial with the pivot of said lever, a stationary gear concentric with the shaft, and gearing connectmg said intermeshing gear and said stationary gear.

6. In a rod-turning machine, a chuck comprising two pairs of positively-driven, centrifugally-actuated, rod-gripping wheels serially positioned in fixed angular relation in different planes, and means for rotating said chuck.

7 In a rod-turning machine, a hollow rotary shaft, stationary gears at opposite ends of said shaft, concentric therewith, two pairs of centrifugally-actuated rod-gripping wheels serially located on saidishaft in planes at right angles, and two sets of gearing on said shaft, adapted to rotate the respective rod-gripping wheels and including orbital gears meshing with the respective stationary gears.

8. In a rod-turning machine, the combi nation of a rod-treating tool, and two automatic chuck-mechanisms located in positions anterior and posterior to said tool for successively engaging the rods and simultaneously rotating and axially advancing them while subjected to the action of the rodtreating tool, each said mechanism including two pairs of positively-rotated gripping wheels serially positioned in fixed angular relation in different planes.

9. In a rod-turning machine, the combination of means for axially feeding and rotating the work, a stock-removing tool mounted alongside the path of the work, and an opposed lateral-thrust member having a grooved working face with an entrance slanting toward the line of feed.

10. In a rod-turning machine, the combination of means for axially feeding and rotating the work, a stock-removing tool mounted alongside the path of the work, and an opposed lateral-thrust member having a grooved working face with an exit slanting away from the line of feed.

In testimony whereof I have hereunto set my hand this 6 day of February, 1918.

JOHN R. GAMMETER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. G. 

